[Previous] | [Session 53] | [Next]

[53.10] Numerical Simulation of Dust Aggregate Collisions (Title Only)

S. Sirono (Kobe Univ.)

The first stage of planet building is collisional coagulation of dust aggregates in the solar nebula. Although the importance of the collision is well recognized, there has been a few attempt to simulate collision of large (~ cm sized) aggregates. Here I report the results of numerical simulations of dust aggregate collisions using SPH hydrocode. The essential parameter is the mechanical strength of dust aggregates, since it is expected that the strength of aggregates varies extensively from 10³\,{\rm dyn\,cm}^-2 (estimated tensile strength of comet SL9: Greenberg et al. 1997) to 10⁷\,{\rm dyn\,cm}^-2 (tensile strength of commercial polycrystalline ice). It has been found that sticking occurs under limited conditions, in which tensile strength is larger than compressive strength of aggregates. This results suggest that the aggregate coagulation processes are highly material dependent, and collisional growth proceeds in the limited locations in the solar nebula.